C&EI S1:
This page is dedicated to C&EI's fleet of S1 yard switchers. The C&EI was the original owner of 4 ALCO S1 units, 3 of which they purchased new and 1 which was purchased second hand.
Original orders:
| Orig. road numbers | model | ALCO serial no. | build date | notes |
| C&EI 103 | S1 | 69593 | 10/1941 | |
| C&EI 104-105 | S1 | 69827-69828 | 8/1942 |
Second hand unit:
| Orig. road numbers | model | ALCO serial no. | build date | notes |
| C&EI 106 | S1 | 73908 | 7/1946 | ex St. Louis & O'Fallon 51 |
S1: C&EI 103 69593 10/1941 C&EI 104 69827 8/1942 to RELX 704 C&EI 105 69828 8/1942 to RELX 705 C&EI 106 73908 7/1946 ex St. Louis & O'Fallon 51 to INLX 85